Billie Jean King is an American former World No. 1 professional tennis player.
King won 39 Grand Slam titles, including 12 singles, 16 women's doubles, and 11 mixed doubles titles.
King won the singles title at the inaugural WTA Tour Championships.
King often represented the United States in the Federation Cup and the Wightman Cup.
She was a member of the victorious United States team in seven Federation Cups and nine Wightman Cups.
For three years, King was the United States' captain in the Federation Cup.
King is an advocate for sexual equality.
In 1973, at age 29, she won the so-called Battle of the Sexes tennis match against the 55-year-old Bobby Riggs, and was the founder of the Women's Tennis Association, World TeamTennis, and the Women's Sports Foundation.
King was inducted into the International Tennis Hall of Fame in 1987.
The Fed Cup Award of Excellence was bestowed on King in 2010.
In 1972, King was the joint winner, with John Wooden, of the Sports Illustrated Sportsman of the Year award and was one of the Time Persons of the Year in 1975.
King has also received the Presidential Medal of Freedom and the Sunday Times Sportswoman of the Year lifetime achievement award.